C :

#include<stdio.h>
int main()
{
    int m,n,t,s;
    scanf("%d",&m);
    n=m/10;
    t=m%10;
    s=t*10+n;
    if(s>m)
        printf("%d",s);
    else
        printf("%d",m);
    return 0;
}

C++ :

#include <bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin>>n;
    int x = n % 10 * 10 + n / 10;
    if(n > x){
    	cout<<n;
	}else{
		cout<<x;
	}
}
 

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int g = a % 10;
		int s = a / 10;
		int b = g * 10 + s;
		if(a > b){
			System.out.println(a);
		}if(a < b){
			System.out.println(b);
		}
	}

}

Python :

n = int(input())
s = n // 10 % 10
g = n // 1 % 10
b = g * 10 + s
if b > n:
    print(b)
else:
    print(n)